15.7. USB Device Operations Failing After Idle Timeout Limit

If a user fails to access a given session for longer than the
screen lock idle timeout interval while an application is
accessing a USB device -- for instance, while copying a large
number of files to or from a USB flash drive -- the session
will be locked. With RHA, NSCM, and authenticated smart cards,
this means the session detaches and all USB devices disconnect
from the session. This can interrupt or abort the
application's access to the device.

The following workarounds are available:

Advise users to monitor their USB device usage to avoid
being timed out

Set the timeout interval value high enough to allow I/O to
complete before the interval elapses

Disable the screen saver

Disable RHA

Note

The last two alternatives are less desirable because they each remove a level of
security. Also, screen savers and RHA are not applicable to kiosk mode.